Abstract：
:In any food fortification program, the stability of added micronutrients is an important factor. Cholecalciferol or vitamin D3 is known to isomerise under various conditions, thereby making its analysis challenging. In the current study, the effects of different parameters, such as temperature, iodine, acidic conditions, and oxidation, on the isomerisation of vitamin D3 were studied using HPLC-DAD and UHPLC-MS/MS. Vitamin D3 thermally and reversibly transforms to pre-vitamin D3 type isomers. In the presence of iodine, cis/trans isomerisation of both cholecalciferol and pre-vitamin D3 takes place to form trans-vitamin D3 and tachysterol, respectively. Another isomer, isotachysterol, was formed under acidic conditions. The different rates of reaction of these products with a dienophile through the Diels-Alder reaction confirmed the formation of vitamin D3 isomerisation products. The derivatization enhanced the ionisation efficiency of vitamin D3 and its isomers in UHPLC-MS/MS and improved the separation and fragmentation enabling sensitive detection.
journal_name
Food Chemjournal_title
Food chemistryauthors
Mahmoodani F,Perera CO,Fedrizzi B,Abernethy G,Chen Hdoi
10.1016/j.foodchem.2016.09.146subject
Has Abstractpub_date
2017-03-15 00:00:00pages
373-381eissn
0308-8146issn
1873-7072pii
S0308-8146(16)31545-Xjournal_volume
219pub_type
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